Apparatus for burning pulverized coal.



v. z. CARACRISTI & J. E. MUHLFELD.

APPARATUS FOR BURNING PULVERIZED COAL. APPLICATION FILED SEPT. I. 1916.

1 ,265, 1 72. Patented May 7, 1918.

2 SHEETS-SHEET I- V. Z. CARACRISTI & J. E. MUHLFELD.

APPARATUS FOR BURNING PULVERIZED COAL. APPLICATION HLED SEPT-1.1916.

1 ,26 5 1 72. Patented May 7, 1918.

L 2 SHEETS-SHEET 2- UNITED STATES PATENT OFFICE.

'VIBGINIUS Z. CABACRISTL'OF BRONXVILLE, AND JOHN E. MUHLFELD, OISCABSDALE, NEW YORK.

.APPABATUS FOB BURNING PULVERIZED COAL.

Specification 01 Letters Patent.

Patented May 7, 1918.

Application filed September 1, 1916. Serial No. 118,014.

VVestchester and State of New York, and the latter a resident ofScarsdale, in the county of Westchester and State of New York, haveinvented certain new and useful Improvements in Apparatus for BurningPulverized- Goal, of which the following is a specification.

The resent invention relates to improvements in apparatus for burningpulverized coal, and particularly for use with such furnaces as forgingfurnaces or the like, where it is essential to obtain an intense heat,properly directed and which may be conveniently and )ositivelyregulated.

1th these and drawings, and will be hereinafter more ully described withreference thereto and finally pointed out in the claims.

In the drawings:

Figure 1 is a side elevation of our improved burner, showing the samedetached from the furnace,

Fig. 2 is a vertical longitudinal sectional view thereof,

Fig. 3 is a vertical sectional view taken on the line 3-3 of Fig. 2,

Fig. 4 is a similar view 4- of Fig. 2,

Fig. 5 is a longitudinal section taken on the line 5-5 of Fig. 2, and

Fig. 6 shows in section the application of our improved burner to a smalforge furnace.

Similar reference characters indicate cor responding arts throughout theseveral figurcs of the drawings.

Referring to the drawings, our invention comprises a cylindrical fuelfeed and mixing chamber 10, to which fuel is fed tangentially underressure therethrough by means of the ori cs 11, to the furnace, thedotted lines 12 indicating the helical path, which the fuel takes. Thepitch of this path, and the length of time the fuel remains in thechamberis determined b the inclination of the nozzle 11 feeding t e fuelinto the orifice, and also by the inertia of the fuel traveling atrelativelyhigh velocity. An air channel 13 is arranged below thechamtaken on the line other objects in view, our invention is shown inthe accompang'mg controlling the flow I ling of the her 10, graduallycontracted toward its forward end, and gradually evolving fromsubstantially semicircular cross section as shown in Fig. 3 torectangular cross-section as shown in Fig. 4. The forward end" extendsbeyond the end of the chamber '10 and is turned up as at l t. A flangeor burner plate 15 is provided surrounding the inner or forward end ofthe chamber 10 and charm nel 13, and serves to secure the channel to thewall of the furnace by means of bolts passinglthrough the bolt holes 16thereof.

As s own in Fig. 1 the outer surface of the walls of the chamber 10 andchannel 13 within the furnace present a smooth and continuous surface.The upper half of the chamber 10 within the furnace is cut away as at17.

At the rear or outer end of the burner the channel extends behind thechamber, and is connected to the chamber 10 by a passage 18, throughwhich air for combustion is supplied to the fuel in the chamber, a valve19 eing provided therein for controlling the I amount of air admitted tothe chamber. A

valve 20 is provided in the channel 13 for of air therethrou h. Thesevalves are respectively actuated diy handles 21 and 22 at the outside ofthe burner.

The fuel emerging from the inner end of the chamber 10 is intermingledand supported by the underlying strata of air from the channel 13. andtravels upwardly through the preliminary combustion zone 23' (Fig. 6)and is forced into the furnace through the orifice 24.. The upward turngiven to the outlet nel 13 causes the stream of air issuing therefrom toassume the condition of an upwardly-moving column the lower end of whichis below, and in advance of, the outlet of the feed and mixing chamber10. The furnace may be of any well known type, and for convenience ofillustration is shown as a small forge furnace and if necessary ordesirable, a plurality of burners may be applied to the mace.

- It will be seen that in addition to the mixing and feeding forward ofthe fuel in the chamber 10, a supporting column of air is supplied tothe emerging mixed fuel, whereupon there is a. thorou h interminfuel andair wit in the preminary combustion chamber 23, and as the end 14 of theair-chem mixture rises therein, there is a progressive combustion withinthis chamber, and at the orifice 24 the combustion is completed.

In this manner the greatest amount of heat energy is produced from. agiven amount of fuel and its force is most effectively directed.

We have illustrated and described a preferred and satisfactory form ofour invention, but it is obvious that changes may be made therein,within the spirit and scope thereof as defined in the appended claims.

e claim:

1. In an apparatus for burning pulverized fuel, two chambers or channelslocated one above the other, the lower chamber forming an air-channelwhich at its outlet end projects beyond the outlet of the upper chamherand has its outlet directed exclusively upwardly to discharge anascending column of air, and means for supplying fuel to the u pperchamber.

2. In an apparatus for burning pulverized fuel, fuel feeding and mixingmeans, means for supplying combustion air to the fuel in the feeding andmixing means, and means for supplylng an underlying ascending col- 1mmof air to said fuel emerging from said feeding and mixing means, the airof said column being adapted to be intermingled with the said fuel.

3. In an apparatus for burning pulverized fuel a fuel feedin and mixinchamber 7 h h 3 means for supplying fuel tangentially to said chamber,and directing the same helically therethrough, means for supplyingcombustion air to the fuel in said chamber, means for controlling thesupply of said combustion air, means for supplying an underlying columnof air to said fuel emerging from said chamber, said air adapted to beintermingled with the said fuel, and means for controlling the supply ofair through said last named means.

4. In an apparatus for burning pulverized fuel, the combination with afurnace having a combustion chamber, of a burner comprising a fuelfeeding and mixing chamber,

bustion chamber, to complete combustion atthe end of said chamber.

5. In an apparatus for burning pulverized fuel, two channels fordelivering fuel and air respectively, the outlet of the air-channelbeing below, and in advance of, the outlet of the fuel channel, anddirected upwardly to discharge an ascending column of 3.11.

6. In an apparatus for burning pulverized fuel, two channels fordelivering fuel and air respectively, the outlet of the air-channelbeing below the outlet of the fuel channel, and directed upwardly todischarge an ascending column of air adjacent to the fuel outlet.

'7. In an apparatus for burning pulverized fuel, afuel-channel providedwith an outlet at its forward end and with a fuel-inlet at its rearportion, an air-channel the rear portion of which communicates with therear portion of the fuel-channel, and the front portion of which has anoutlet 'lo cated below, and in advance of, the outlet of thefuel-channel, and directed upwardly to discharge an ascending column ofair, a valve located in the air-channel to regulate the flow of airtherethrough, and another valve controlling the communication betweenthe rear portions of the two channels.

In testimony, that we claim the foregoing as our invention, we havesigned our names in presence of two subscribing witnesses.

VIRGINIUS Z. CARACRISTI. JOHN E. MUHLFELD.

Witnesses:

J. C. CHAPPLE, C. G. MILLER.

